Shirley Dobson, wife of Focus on the Family founder James Dobson, gave a deposition Tuesday after being named in a suit claiming the National Day of Prayer is unconstitutional.

The Freedom from Religion Foundation says the event violates the establishment clause of the U.S. Constitution.

Earlier this year, attorneys for the Alliance Defense Fund asked a federal court to dismiss the lawsuit.

"Prayer proclamations are a long-established and cherished American tradition going back to the Founding Fathers," said ADF Senior Legal Counsel Joel Oster. "This is simply a ridiculous lawsuit and an example of one radical organization's allergic reaction to anything involving God."

In addition to Dobson, chair of The National Day of Prayer Task Force, the atheist group also sued several government officials including former President George W. Bush and Wisconsin Gov. Jim Doyle.

It's not known if, or when, the case will go to court.

The National Day of Prayer was first established by in 1952 by President Harry S. Truman.